gSPEC at GSI/FAIR

J. Gerl

gSPEC Workshop

27. September 2018

Milano, Italy

The limits of nuclear existence (lifetimes, decays, …)

Ground state properties (masses, radii, …)

Structure of excited states (shell structure, shapes, …)

Unbound and other exotic system (halo, skin, hypernuclei, …)

Nuclear equation of state

NUclear STructure Astrophysics and Reactions

Exploring the extremes with NUSTAR@FAIR

NUSTAR - The Project

PSP

codeSuper-FRS RIB production, separation, and identification

1.2.2HISPEC/

DESPEC

In-beam -spectroscopy at low and intermediate energy, n-decay, high-

resolution -, -, -, p-, spectroscopy

1.2.3 MATS In-trap mass measurements and decay studies

1.2.4 LaSpec Laser spectroscopy

1.2.5 R3B Kinematical complete reactions with relativistic radioactive beams

1.2.6 ILIMA Large-scale scans of mass and lifetimes of nuclei in ground and

isomeric states

1.2.10 Super-FRS High-resolution spectrometer experiments

1.2.11 SHE Synthesis and study of super-heavy elements

1.2.8 ELISe(*) Elastic, inelastic, and quasi-free e--A scattering

1.2.9 EXL(*) Light-ion scattering reactions in inverse kinematics

(*) NESR required – alternative/intermediate “operation” within FAIR MSV under consideration.

Exploring the extremes with NUSTAR@FAIR

NUSTAR Date Test/

sub-system completion Commissioning

LEB infrastr. 1,606 06/2023

HISPEC/DESPEC 10,949 03/2024

MATS 1,173 08/2024

LaSpec 253 05/2021

R3B 17,313 03/2023

ILIMA 1,099 12/2023

80% 92% 54%value

weightedsecured value weighted

interface items 2,000

87% 51%

secured value weighted34,393

32,393

Day

1

TDR Cost [k€ 2005] Funding Construction

NUSTAR Progresses very well

…more details by AlexExploring the extremes with NUSTAR@FAIR

DESPEC: Decay Spectroscopy

detectors

Calorimeter

production

selection

identification

implantation

spectroscopy

Active

Implanter

DESPEC Layout 2018

AIDA

Plastic

FATI

MA

DEGA

S

GALIL

EO

S2 area S4

area

6

DESPEC Layout 2018

AIDA

Plastic

FATIMADEGAS

GALILEO

S2 areaS4 area

7

8FAIR NUSTAR JG

NUSTAR Overall Schedule

FAIR NUSTAR JG

NUSTAR Phase 0 and Day 1

FAIR NUSTAR JG

E121 Measurement of the bound-state beta decay of bare 205

Tl ions

E127 Measurements of proton-induced reaction rates on radioactive isotopes for the astrophysical p

process

S465 Dipole response of the drip-line nuclei 6He and

22,24O

S442 Study of multi-neutron configurations in atomic nuclei towards the drip line

S467 Single-particle structure of neutron-rich Ca isotopes: shell evolution along Z=20

S455 Fission investigated with relativistic-radioactive beams and the advanced SOFIA@R3B setup

S447 Studies of the d+p signal and lifetime of the 3ΛH and

4ΛH hypernuclei by new spectroscopy

techniques with FRS

S474 Detector tests with the prototype of the CSC for the Super-FRS and direct mass measurements of

neutron-deficient nuclides below 100

Sn

S468 Search for new neutron-rich isotopes and exploratory studies in the element range from terbium to

rhenium

S452 The Oblate-Prolate Shape Transition around A~190

S460 Investigation of 220-A-230 Po-Fr nuclei lying in the south-east frontier of the A~225 island of

octupole deformation

S450 Study of N=126 nuclei: isomeric and beta decays in 202

Os and 203

Ir

DE

SP

EC

S

up

er-

FR

S R

3B

E

XL IL

IMA

FRS and detector commissioning/development w. parasitic beam

Granted beam time at FAIR/GSI Phase-0

11

Planned NUSTAR Experiments in 2018

NUSTAR UNILAC

NUSTAR SIS/FRS

During accelerator commissioning in Summer it turned out that the RFQ

can run only up to 6 V RF amplitude instead of 10 V!

-> No intense heavy beams!

In August a fire of a power transformer in the UNILAC RF gallery

caused a major disruptio of the accelerator start-up.

After decontamination of the polluted area it was discovered that

aluminum particles causing a massive shortcut were the reason for the

fire.

Before operation can resume all electrical devices in the area need to

be thoroghly cleaned -> No user beams this year!

Desaster of the year…

ion mass q_min q_bestI_TK(q_best)

[eµA]

I(q_min) / I(q_best)

(LEBT)

I_TK(q_min)

[eµA]q(SIS18)

N(Spill)

[10^7]

dN/dt(mean)

[10^7/sec]comment dN/dt(anticipated) Reduction

summary TK-stripped no cooler [10^7/sec]

P

b 208 5 4 400 0,01 4 67 1,0 0,3 m = 12 50 152Au 197 5 4 300 1,00 300 65 76,0 25,3 T = 2.2 µs 150 6

A

g 107 3 2 440 0,50 220 43 84,3 28,1 100 4

U 238 5 4 800 0,10 80 73 18,1 6,0

RFQ at 80% voltage, scaling =

0,2(source)*0,5(RFQ) 200 33

Fe 56 2 3 44,7 1,00 44,7 25 29,5 9,8

Tcycl = 1

sec

Bi 209 5 4 800,0 0,28 224 68 54,3 18,1 no experience w.r.t. stability Text = 2 sec

Ta 181 5 4 988,5 0,15 148,275 61 40,1 13,4 no experience w.r.t. stability

X

e 132 3 3 161,4 0,80 129,12 48 44,3 14,8 RFQ at 95% voltage, scaling = 0,8(RFQ)*...(source) 200 14Sn 112 3 5 6,0 1,00 6 45 2,2 0,7

Kr 86 2 2 2500,0 1,00 2500 33 1248,3 416,1

Kr 84 2 2 125,0 1,00 125 34 60,6 20,2

Ni 58 2 2 1200,0 1,00 1200 26 760,5 253,5

Ti 50 2 2 30,0 1,00 30 22 22,5 7,5 20 3

Xe 124 3 3 700 1,00 700 48 240,3 80,1 enriched material from ion source

Xe 136 4 3 500 0,35 175 48 60,1 20,0 enriched material from ion source

Mo 92 2 2 200,0 0,80 160 42 62,8 20,9 RFQ at 95% voltage, scaling = 0,8(RFQ)*...(source)

Available beam intensities in 2018 with defect RFQ(Announced by Accelerator Section on 9.7.18)

RFQ structures are affected by beam sputtering and

surface degradation.

Reasons not yet fully understood.

Replacement needed.

Components need 8

months to be delivered

and installed.

Machine meeting 28.08.18 - UNILAC

ER1 fire and RF ventilation contamination

• Fire in the ER1 transformer

• Power-off in the entire rf gallery

• Separation of the ER1 system• No single gap resonators

• Cleaning of all amplifiers AND all

transformers• No rf operation until mid. Oct.

No more physics beam time 2018

• Engineering run: Nov. 2018 – Dec. 2018– Goal: to establish basic operation conditions that are required for the Physics

program in 2019

– boundary conditions:• limited capabilities of new FAIR controls

– Not yet comprehensive tools including up to date lattice layouts forbeamline tuning

– no storage mode capabilities available for comprehensive ESR commissioning

• Physics run: March 2019 – April 2019– Goal: to provide reliable operation for the scheduled Physics programs

– boundary conditions• limited choice of heavy ions due to HSI RFQ technical limitation

• No single gap resonators at the end of post striper

• No parallel operation in planning to ensure reliability

• Engineering run: Nov. 2019 – Dec. 2019– Goal: 1) to establish ESR storage mode 2) to establish deceleration in ESR 3) to

complete the comissioning of CRYRING with ESR beam

– newly introduced FAIR controls for ESR must allow storage mode• Expect to be available for commissioning no earlier than Sept. 2019

Foil by Mei Bai

Accelerator Goals and Boundary conditions

Schedule for early 2019 operation

suggested by Accelerator division

Schedule for early 2019 operation

wanted by Research division

Status 24.9.18:

• All experiments need to be re-scheduled in 2019/20.

• Beam is planned to be provided again earliest from February 2019.

• Beam time will start with 107Ag to test the quality for HADES and to

start the NUSTAR commissioning.

• When NUSTAR requests, 209Bi will be provided for intensity test

and further commissioning.

• In the best case one experiment per sub-collaboration might be

possible (NUSTAR Beam Coordination Committee will investigate)

• Operation based on a regular beam schedule may start in January

2020

Beam scheduling is curently being revised

Phase-1 start-up scenarios and implications for day-1

20

NUSTAR start-up scenariofor an advanced start of FAIR Phase-1

1. Step

requires

UNILAC + SIS18 + S-FRS

realisation:

complete installation, followed by

stepwise commissioning

first physics experiments in stages

1. Intermediate S-FRS focal planes

2. HEB

3. LEB

Covers about 70% of Day-1 Physics

Phase-1 start-up scenarios and implications for day-1

22

FAIR start-up scenariosfor an advanced start of FAIR Phase-1

Advanced realisation of

H-ESR and Super-FRS

will be investigated

Phase-1 start-up scenarios and implications for day-1

Advantages

Early start of Phase-1 physics experiments

Reduced risk by not requiring SIS100 operation

Reduced risk by better resource balancing

Reduced risk by staged approach not requiring full NUSTAR facility

at once

Disadvantages

Not serving all experiments from the beginning

Longer total start-up time

23

gSPEC with PARIS

PARIS Increased efficiency

Sufficient energy resolution

Complementing Ge